gmp_hamdist

Hamming distance (PHP 4 >= 4.0.4, PHP 5)
int gmp_hamdist ( resource a, resource b )

Returns the hamming distance between a and b. Both operands should be non-negative.

例 675. gmp_hamdist() example

<?php
$ham1
= gmp_init("1001010011", 2);
$ham2 = gmp_init("1011111100", 2);
echo
gmp_hamdist($ham1, $ham2) . "\n";

/* hamdist is equivilent to: */
echo gmp_popcount(gmp_xor($ham1, $ham2)) . "\n";
?>

The printout of the above program will be:

6
6

See also gmp_popcount(), gmp_xor()